Fix: Proper includes for Python wheel

Previous wheels did not include the package sources.
This change makes sure the top-level dm_robotics directory is included
even though it does not contain a __init__.py file for compatibility
with other packages under the same directory.

Author: JeanElsner

pyproject.toml

@@ -3,8 +3,12 @@ requires = ["hatchling"]
 build-backend = "hatchling.build"
 
 [tool.hatch.build]
-include = ["src"]
-sources = ["src"]
+include = [
+  "dm_robotics",
+]
+
+[tool.hatch.build.sources]
+"src/dm_robotics/panda" = "dm_robotics/panda"
 
 [project]
 name = "dm-robotics-panda"